Hello there again,i borrowed (before purchasing) nice Canon AT-1 film SLR, and there is some smudges on the thing over mirror - the thing where you see image, but i dont know how is it called in english. It also has two circles which helps focusing.

Well the main question is - how, and with what should i clean that thing? When i am doing it with alcohol and ear sticks, it gets into little grooves that is on that thing (thank god that focusing part is easy to clean).

There is not much space there, so i cant use brush or something, and cloth is unusable. Some ideas? How did you or your grandfathers clean that?